| Citation: |
YU Jin-ge, MA Zhan-yuan, ZHANG Ying, YANG Xi-ming, HAN Chao, XU Xiang-hui. SIMULATION AND MEASUREMENT OF MULTI-FREQUENCY COMBINED WAVEFORM GUST FIELD[J]. Engineering Mechanics, 2024, 41(3): 250-256. DOI: 10.6052/j.issn.1000-4750.2022.04.0356
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The device parameters, such as the number, span, chord length and spacing of generator vanes of the FL-51 wind tunnel gust generator are selected by numerical simulation methods. The generator adopts the independent driving form of the hydraulic swing cylinder, which can simulate the multi-frequency combined motion of various waveforms such as sine wave, triangle wave and random wave. At the same time, it can reduce the installation of transmission and improve the performance of the generator. Using the flow display technology to study the generation and development process of the gust flow field can realize the refinement and visualization characteristics of the gust flow field. The results of the gust field calibration show that: the blade can achieve a swing frequency of 0 Hz-15 Hz, and the sinusoidal flow field generated by the generator is relatively uniform within the calibration range; when the incoming wind speed is 40 m/s, the blade swing frequency is 10 Hz and the swing angle at 15°, the maximum gust amplitude is 8.5 m/s. The results of ground test and flow field calibration show that: the gust field simulation technology proposed can realize multi-frequency and multi-waveform combined motion in low-speed wind tunnels, and provide complex gust flow field for wind tunnel test.
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